Subject: [Healeys] Another thread question

From: Michael Salter via Healeys <[email-masked]>
Date: Wed, 11 Aug 2021 13:40:58 -0400

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The inhibitor switch which is used in overdrive gearboxes has a thread that
I cannot identify.
Measuring the outside diameter of the thread I get 0.618" ... probably 5/8"
(0.625)
The TPI is 13 ... definitely not 12 or 14.
Can't find it in my limited resources ...
Anyone able to identify this thread for me?

M

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,sa=
ns-serif;font-size:small">The inhibitor switch which is used in overdrive g=
earboxes has a thread that I cannot identify.</div><div class=3D"gmail_defa=
ult" style=3D"font-family:arial,sans-serif;font-size:small">Measuring the o=
utside diameter of the thread I get 0.618&quot; ... probably 5/8&quot; (0.6=
25)</div><div class=3D"gmail_default" style=3D"font-family:arial,sans-serif=
;font-size:small">The TPI is 13 ... definitely not 12 or 14.</div><div clas=
s=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-size:small">=
Can&#39;t find it in my limited resources ... <br></div><div class=3D"gmail=
_default" style=3D"font-family:arial,sans-serif;font-size:small">Anyone abl=
e to identify this thread for me?</div><div class=3D"gmail_default" style=
=3D"font-family:arial,sans-serif;font-size:small"><br></div><div class=3D"g=
mail_default" style=3D"font-family:arial,sans-serif;font-size:small">M<br><=
/div></div>

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From: Henry G Leach via Healeys <[email-masked]>
Date: Thu, 12 Aug 2021 01:39:46 +0000 mRKGqbbpvvHXyCAtxaeL8GO48Ozm7IxDn3PLHmFEwRL1RQD03ueypJkVxilmd3+EX/IESP0XcRDKW2uVGST+LME30GRP6G/F0LSscUpJthVyPC1esIpd3eeI

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Michael- I'm not finding anything with 13TPI. I assume you are=0Areferri=
ng to part 1B3665 (#22 in GB diagram). The switch that goes in,=0A2H2272=
 was changed to 11G3062. Not sure if that part change was to UNF=0Aor ju=
st from screw terminal to clips. If they kept the same thread=0Athru out=
 production it must be some kind of British:=0A5/8 Whitworth 15.875MM 55=
degrees 5/8 BSF is 14TPI5/8 BSPF (British=0AStandard Pipe Parallel) 55de=
grees, 14TPI also called HSS5/8 BSC=0A(British Std. Cycle) fine thread5/=
8 BSTP (British Standard Taper) ?=0ABy the way there is one for sale on=
 ebay for $45. Regards, Hank=0A=0A=09-----------------------------------=
------From: "Michael Salter via=0AHealeys" =0ATo: "[email-masked]=
t"=0ACc: =0ASent: Wednesday August 11 2021 10:42:15AM=0ASubject: [Healey=
s] Another thread question=0A=0A  The inhibitor switch which is used in=
 overdrive gearboxes has a=0Athread that I cannot identify. Measuring th=
e outside diameter of the=0Athread I get 0.618" ... probably 5/8" (0.625=
) The TPI is 13 ...=0Adefinitely not 12 or 14. Can't find it in my limit=
ed resources ...=0A Anyone able to identify this thread for me? =0A M=0A

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<html><body>Michael- I'm not finding anything with 13TPI.&nbsp; I assume=
 you are referring to part 1B3665 (#22 in GB diagram).&nbsp; The switch=
 that goes in, 2H2272 was changed to 11G3062.&nbsp; Not sure if that par=
t change was to UNF or just from screw terminal to clips. If they kept t=
he same thread thru out production it must be some kind of British:<div>=
<br></div><div>5/8 Whitworth 15.875MM 55degrees&nbsp;</div><div>5/8 BSF=
 is 14TPI</div><div>5/8 BSPF (British Standard Pipe Parallel) 55degrees,=
 14TPI also called HSS</div><div>5/8 BSC (British Std. Cycle) fine threa=
d</div><div>5/8 BSTP (British Standard Taper)&nbsp; ?</div><div><br></di=
v><div>By the way there is one for sale on ebay for $45. Regards, Hank</=
div><div><br></div><div><br></div><div><br></div><div><br></div><div><br=
><div class=3D"reply-new-signature"></div><p>---------------------------=
--------------</p>From: "Michael Salter via Healeys" <[email-masked]=
.net><br>To: "[email-masked]"<br>Cc: <br>Sent: Wednesday August=
 11 2021 10:42:15AM<br>Subject: [Healeys] Another thread question<br><br=
>=0A<div dir=3D"ltr">=0A<div class=3D"gmail_default" style=3D"font-famil=
y:arial, sans-serif;font-size:small;">The inhibitor switch=0Awhich is us=
ed in overdrive gearboxes has a thread that I cannot=0Aidentify.</div>=
=0A<div class=3D"gmail_default" style=3D"font-family:arial, sans-serif;f=
ont-size:small;">Measuring the=0Aoutside diameter of the thread I get 0.=
618" ... probably 5/8"=0A(0.625)</div>=0A<div class=3D"gmail_default" st=
yle=3D"font-family:arial, sans-serif;font-size:small;">The TPI is 13 ...=
=0Adefinitely not 12 or 14.</div>=0A<div class=3D"gmail_default" style=
=3D"font-family:arial, sans-serif;font-size:small;">Can't find it in my=
=0Alimited resources ...<br></div>=0A<div class=3D"gmail_default" style=
=3D"font-family:arial, sans-serif;font-size:small;">Anyone able to=0Aide=
ntify this thread for me?</div>=0A<div class=3D"gmail_default" style=3D"=
font-family:arial, sans-serif;font-size:small;"><br></div>=0A<div class=
=3D"gmail_default" style=3D"font-family:arial, sans-serif;font-size:smal=
l;">M<br></div>=0A</div>=0A</[email-masked]></div></body></html>

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[email-masked]

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From: "m.g.sharp--- via Healeys" <[email-masked]>
Date: Thu, 12 Aug 2021 07:47:43 -0400

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Mike, it is a longshot, but could the fitting have been over-tightened =
in the past and the threads have pulled?  That is not uncommon on =
smaller bolts, and I had that issue with the rear axle of the TC once.  =
I could not get a new nut on the right side and when I looked carefully =
the tpi varied across the threaded length of the axle.  In that case it =
was a LH thread, and I think some ham-fisted in the mechanic, in trying =
to =E2=80=9Cundo=E2=80=9D it used excessive force.  Of course he was =
turning it the wrong way and he simply stretched the threads.  I had a =
devil of a time fixing that!

=20

Cheers, Mirek

=20

From: Healeys <[email-masked]> On Behalf Of Michael =
Salter via Healeys
Sent: August 11, 2021 1:41 PM
To: [email-masked]
Subject: [Healeys] Another thread question

=20

The inhibitor switch which is used in overdrive gearboxes has a thread =
that I cannot identify.

Measuring the outside diameter of the thread I get 0.618" ... probably =
5/8" (0.625)

Can't find it in my limited resources ...=20

=20

M

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vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Mike, it is a longshot, but could =
the fitting have been over-tightened in the past and the threads have =
pulled?=C2=A0 That is not uncommon on smaller bolts, and I had that =
issue with the rear axle of the TC once.=C2=A0 I could not get a new nut =
on the right side and when I looked carefully the tpi varied across the =
threaded length of the axle.=C2=A0 In that case it was a LH thread, and =
I think some ham-fisted in the mechanic, in trying to =
=E2=80=9Cundo=E2=80=9D it used excessive force.=C2=A0 Of course he was =
turning it the wrong way and he simply stretched the threads.=C2=A0 I =
had a devil of a time fixing that!<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Cheers, =
Mirek<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Healeys =
&lt;[email-masked]&gt; <b>On Behalf Of </b>Michael =
Salter via Healeys<br><b>Sent:</b> August 11, 2021 1:41 PM<br><b>To:</b> =
[email-masked]<br><b>Subject:</b> [Healeys] Another thread =
question<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>The inhibitor =
switch which is used in overdrive gearboxes has a thread that I cannot =
identify.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Measuring the =
outside diameter of the thread I get 0.618&quot; ... probably 5/8&quot; =
(0.625)<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>The TPI is 13 =
... definitely not 12 or 14.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Can't find it =
in my limited resources ... <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Anyone able to =
identify this thread for me?<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p>&nbsp;</o:=
p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>M<o:p></o:p></s=
pan></p></div></div></div></body></html>
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